Stun gun



FIG. 1 is a top plan view of a stun gun showing my new design, the bottom plan view being a mirror image of the top;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left elevation view thereof; and,

FIG. 5 is a right elevation view thereof. 

The ornamental design for a stun gun, as shown and described. 